This user accepts a recurring meeting request, and the
recurring meeting is synchronized to the mobile device.

This user accepts an update to an instance of this
recurring meeting on the mobile devices.

In this scenario, the user may obtain duplicate calendar
items for the updated instance on the mobile device, and these duplicate
calendar items cause conflicts and are confusing to the user.

Note By default, the Direct Push feature is enabled on a Windows
Mobile 5.0 device that has the Messaging and Security Feature Pack (MSFP)
installed or on a Windows Mobile 6.x device (Windows Mobile 6.x devices do not
use the Messaging and Security Feature Pack).

Exchange
ActiveSync offers Direct Push technology. Direct Push uses an encrypted HTTPS
connection that is established and maintained between the device and the server
to push new e-mail messages and other Exchange data to the device. During the
response processing of a recurring
meeting request, a wrong meeting ID is used that causes unwanted
duplication.